Doubletick - Email Tracking for Gmail and GSuite vs. Mixmax

Doubletick is Free and unlimited email tracking for Gmail and Google Workspace (G Suite) with real-time desktop notifications and WhatsApp like double tick marks (✓✓) in your sent box. A single blue tick ✓ indicates that an email has been sent, but yet to be opened by the recipient. Double blue ticks ✓✓ mean that your email has been opened by the recipient and grey ticks indicates that email is not tracked.

Mixmax works inside Gmail so nothing falls through the cracks. Founded in 2014, it's used by people who handle their own outreach — founders, agency owners, recruiters, consultants, fundraisers and small business owners — and by the teams they work with. When you send an email, Mixmax keeps track of it. You can see when someone opens it or clicks a link. If they don't reply, Mixmax reminds you, or sends your next email for you. By default, follow-ups stop the moment the person writes back, so nobody gets another nudge after they've answered.